[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.280756][ T25] audit: type=1800 audit(1570979526.130:25): pid=7003 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.322622][ T25] audit: type=1800 audit(1570979526.130:26): pid=7003 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.348906][ T25] audit: type=1800 audit(1570979526.130:27): pid=7003 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.55' (ECDSA) to the list of known hosts. 2019/10/13 15:12:16 fuzzer started 2019/10/13 15:12:16 dialing manager at 10.128.0.105:40973 2019/10/13 15:12:16 syscalls: 2523 2019/10/13 15:12:16 code coverage: enabled 2019/10/13 15:12:16 comparison tracing: enabled 2019/10/13 15:12:16 extra coverage: extra coverage is not supported by the kernel 2019/10/13 15:12:16 setuid sandbox: enabled 2019/10/13 15:12:16 namespace sandbox: enabled 2019/10/13 15:12:16 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 15:12:16 fault injection: enabled 2019/10/13 15:12:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 15:12:16 net packet injection: enabled 2019/10/13 15:12:16 net device setup: enabled 2019/10/13 15:12:16 concurrency sanitizer: enabled syzkaller login: [ 44.938506][ T0] ================================================================== [ 44.946664][ T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 44.955664][ T0] [ 44.957978][ T0] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 44.965629][ T0] tick_do_update_jiffies64+0x105/0x260 [ 44.971155][ T0] tick_sched_do_timer+0xd4/0xe0 [ 44.976070][ T0] tick_sched_timer+0x43/0xe0 [ 44.980727][ T0] __hrtimer_run_queues+0x288/0x600 [ 44.985901][ T0] hrtimer_interrupt+0x22a/0x480 [ 44.990989][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.996459][ T0] apic_timer_interrupt+0xf/0x20 [ 45.001406][ T0] __kcsan_setup_watchpoint+0xa8/0x510 [ 45.006837][ T0] __tsan_read4+0x2c/0x30 [ 45.011141][ T0] tcp_grow_window.isra.0+0x58/0x480 [ 45.016484][ T0] tcp_event_data_recv+0x68f/0x990 [ 45.021567][ T0] tcp_rcv_established+0xbfe/0xf50 [ 45.026648][ T0] tcp_v4_do_rcv+0x381/0x4e0 [ 45.031209][ T0] tcp_v4_rcv+0x1a03/0x1bf0 [ 45.035681][ T0] [ 45.037987][ T0] read to 0xffffffff8603f008 of 8 bytes by task 0 on cpu 0: [ 45.045260][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 45.050694][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 45.056562][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 45.061647][ T0] do_idle+0xb0/0x2c0 [ 45.065601][ T0] cpu_startup_entry+0x1b/0x20 [ 45.070334][ T0] rest_init+0xec/0xf6 [ 45.074378][ T0] arch_call_rest_init+0x17/0x37 [ 45.079374][ T0] start_kernel+0x83e/0x864 [ 45.083852][ T0] x86_64_start_reservations+0x29/0x2b [ 45.089290][ T0] x86_64_start_kernel+0x72/0x76 [ 45.094203][ T0] secondary_startup_64+0xa4/0xb0 [ 45.099192][ T0] [ 45.101488][ T0] Reported by Kernel Concurrency Sanitizer on: [ 45.107614][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 45.114340][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.124372][ T0] ================================================================== [ 45.132408][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 45.138970][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 45.145710][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.155738][ T0] Call Trace: [ 45.159045][ T0] dump_stack+0xf5/0x159 [ 45.163268][ T0] panic+0x209/0x639 [ 45.167186][ T0] ? x86_64_start_reservations+0x29/0x2b [ 45.172805][ T0] ? vprintk_func+0x8d/0x140 [ 45.177372][ T0] kcsan_report.cold+0xc/0x1b [ 45.182023][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.187549][ T0] __tsan_read8+0x2c/0x30 [ 45.191882][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 45.197317][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 45.203196][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 45.208295][ T0] do_idle+0xb0/0x2c0 [ 45.212254][ T0] cpu_startup_entry+0x1b/0x20 [ 45.216992][ T0] rest_init+0xec/0xf6 [ 45.221039][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 45.228209][ T0] arch_call_rest_init+0x17/0x37 [ 45.233119][ T0] start_kernel+0x83e/0x864 [ 45.237599][ T0] x86_64_start_reservations+0x29/0x2b [ 45.243034][ T0] x86_64_start_kernel+0x72/0x76 [ 45.247949][ T0] secondary_startup_64+0xa4/0xb0 [ 45.254300][ T0] Kernel Offset: disabled [ 45.258617][ T0] Rebooting in 86400 seconds..